COMPAR is a computer program developed to compare multigroup cross sections generated by
the codes NJOY, GROUPIE, FLANGE-II, ETOG-3 and XLACS.

5. METHOD OF SOLUTION

COMPAR evaluates multigroup neutron cross sections for the elastic scattering, capture and fission
reactions for one or more materials from various previously formatted files. Thus, it is possible to
analyze the influence of files 2 (resonances) and 3 (background) of the evaluated nuclear data libraries.
The COMPAR system consists of the following interface modules: REDCOMP, FLACOMP,
ETOCOMP, and XLACOMP. These programs correspond to the cross section processing programs
GROUPIE, FLANGE-II, ETOG-3, and XLACS respectively. NJOY GENDF data may be converted
to COMPAR format using PSR-239/RGENDF.

6. RESTRICTIONS OR LIMITATIONS

Refer to Appendix A of the referenced document for information on limitations.

7. TYPICAL RUNNING TIME

The following execution times were noted on the CDC Cyber 170/750 for three selected problems
(input tape = TAPE10).

COMPAR

CTAPE101 0.95 seconds

CTAPE102 0.62 seconds

CTAPE103 0.55 seconds

FLACOMP 0.10 seconds

ETOCOMP 0.20 seconds

XLACOMP 0.41 seconds

REDCOMP 2.48 seconds

8. COMPUTER HARDWARE REQUIREMENTS

The code runs on the CDC Cyber 170/750.

9. COMPUTER SOFTWARE REQUIREMENTS

The codes execute with the CDC FTN5 compiler under NOS 2.5.3.

10. REFERENCES

J. Anaf and E. S. Chalhoub, "COMPAR: A System For Comparing Multigroup Cross Sections
Generated by NJOY, GROUPIE, FLANGE-II, ETOG-3 and XLACS," INDC(BZL)-024/GV (Feb.
1988) translated by the IAEA from Portuguese into English from IEAv-014/87 (Nov. 1987).

Notes on CDC random-access routines: OPENMS, READMS and WRITMS.

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents and one (360K) DOS diskette containing source codes plus
sample problem input and output.